The background-position property
The background-position property sets the position of a background image.
The background-position property uses values like left, right and numbers to position images.
You can position your images how you wish using the background-position. I will give it a value of center, because I want the image to be at the center position.
Example,
index.html
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8"/>
<title>A simple html page</title>
<link rel="stylesheet" href="styles.css"/>
</head>
<body>
<header>A good illustration</header>
<main>This is a web page</main>
</body>
</html>
styles.css
body {
background-image: url("../img/google_image.png");
background-size: cover;
background-position: center;
}

This makes the image to remain at the center while occupying the full width of its container.